Polishing machine for spoons



g- 4, 1931- D. G. GRISWOLD 1,817,554

POLISHING MACHINE FOR SPOONS Filed July 12, 1-929 7 Sheets-Sheet l i Q l N V ENTO R flamvwy & 5AM l 1' M3 Aug. 4, 1931. D. G. GRISWOLD 1,817,554

I POLISHING MACHINE FOR SPOONS Filed July 12. 1929 7 sheets-sheet 2 INVENTOR 157M155 ATTORNEY Aug. 4, 1931. D. G. GRISWOLD 1, romsaiim MACHINE FOR SPOONS Filed July 12. 1929 7 Sheets-Sheet 3 ATTORNEY rm- :1 I J g 88 rm 2 Q: 4 ||1| INI N N a i 4 W; N Y Hi Aug. 4, 1931. D. G. GRISWOLD 1,817,554

POLISHING MACHINE FOR SPOONS I Filed July 12, 1929 7 Sheets-Sheet 4 ATTORNEY Aug. 4, 1931. I D. G. GRISWO LD' 1,817,554

' POLISHING MAGHINEQFOR SPOONS Filed July 12, 1929 7 Sheets-Sheet 5 INVENTOR wwuvigaf ATTORNEY Aug. 4,'1931.' D. G. GRISWOLD POLISHING MACHINE FOR SPOONS 1929 7 Sheets-Sheet 6 Filed July 12 INVENTIOR ATTORNEY Aug. 4, 1931. D. cs. GRISWOLD POLISHING. MACHINE FOR SPOONS Filed July 12. 1929 7 Sheets-Sheet 7 INVENTOR 19mg. 5M W1 MM ATTYORNEY Patented Aug. 4, 1931 I UNITED STATES PATENT OFFICE DARWIN G. GRISWOLD, L INCEQRD, CONNECTICUT, ASSIGNOR To" B. WALLACE CUT & SONS MFG-00., OF WALLINGF ORD, CONNECTICUT, .A CORPORATION ,OFiCONNECTI- POLISHING MACHINE on SPOONS j Application filed idl -1'2, 1929. Serial na's'msea.

bowl, but it will be understood thatthe in- I This invention relates to polishing 'ma chines and particularly to a polishing inachine adapted to operate upon different portions of a spoon bowl, orthelike, with successive polishing heels.- I j in existing types of automatic polishing machines small objects to be polished are attached to a carrier belt which brings the Work into contact with various polishingwheels which are located so as to polish various surfaces of ihe work. Such machines, while satisfactory ,for polishing plane and some convex surfaces, are not adapted to polish concave surfaces such as-the interiors of spoon bowls, or convex surfaces such" as the exteriors of spoonbowls.

A primary object ofthis invention is to provide a completely automatic machine" adapted to polish the bowl ofa spoon, or the like, by successive operations upon the convex and concave surfaces thereof by a "plurality of consecutively used rotating polishing wheels. Other objects and feature of the invention will bepointed out or will become apparent upon a reading of thespecification. r y y Briefly stated, in 1a preferred-form of the invention I employ a plurality of power,

driven polishing Wheels, means to reciprocate these polishing wheels, a powerdriven carrierbelt', means for advancing the same step by step past the "polishing wheels, a plurality of work holders, each being pivoted about an axis and adapted to raise a piece of work from the carrier belt and holdthe work in operative position in contact with a polishing wheel and return the work to the carrier belt,means to oscillate the work holders about a second axis, automatic means to turn the work upside down during its movement along the machine, and an abradant supplying means, the operation of'thework holders about both axes and the operation of V ing-the inner and outersurfaces of a spoon machine,the abradant supplying mechanism being omitted; Fig. l 'is a continuation of mg a similar view of the remainder of-the machine; l I

Fig. 2 is a transverse sectional view ofthe machine showing a polishing wheel and means for advancing a spoon being polished into position against a wheel;

Fig. 1 show- Fig. 8 is a front elevationof a portion of the carrier beltfor the work and its operating means; j

F 1g. 1s a perspective View of the work supportlng and conveying belt shown in F1g.3; 1 1g. 5 1s a sectlona-l view showing a portion of the oscillating means for the work holdingand transfer means Fig. 6 is a side elevational' view of the work clamping and transferringmeans showing a spoon 1n contact with a wheel and having a portion of theinner surface of the bowl v polished;

Fig. 7 is a series of fragmenta-rysectional views showing a wheel engaging a portion of the inner surface of a spoon bowl,the work and its supporting meansbeing shown in successive 'oscillated positions Fig. Sshows a spoon, the portion of the bowl operated upon-'bythe Wheel shown-in Fig. 7 being unshaded;

'9 includes a series of fragmentary sec- .tional views similar to F ig. 7 showing another wheel operating upon a different portion of the inside or concave surface ofthe spoon bowl; 1 i I Fig'llO shows a spoon, the'portion'oper- .atedupon by the-wheel'in Fig. 9 and by the previous wheel being unshaded; Fig. 11. is a series of views s milar to F g. 7 showingthe operation of a third polishing wheel upon a different section of the inside surface of the spoon bowl;

Fig. 12 shows a spoon, the surface operated on by the wheel in Fig. 11 and by the previous wheels being unshaded;

Fig. 13 is a fragmentary view of the work holding and transferring mechanism with the spoon shown turned over and held in position for operation upon its outer or convex surface; I

Fig. 14 is a series of fragmentary views showing a wheel operating upon one portion of the outside surface of a spoon bowl;

Fig. 15 shows a spoon, the portion polished by the wheel shown in F ig. 14 being unshaded; I

Fig. 16 is a series of views similar to Fig.

. 14 showing the wheel operating upon another portion of the outside surface of the spoon bowl; 7

Fig. 17 shows a spoon, the part operated upon by the wheel shown in Fig. 16 and by the preceding wheel being unshaded; and

Fig. 18 is an isometric view showing the spoon turning device associated with the traversing carrier belt for the spoons.

In the above mentioned drawings, I have shown but one embodiment of the invention which is now deemed preferable, but it is to be understood that changes and modifications may be made within the scope of the appended claims without departing from the spirit of the invention.

In said illustrative drawings, 10 indicates a frame on which the polishing mechanism is supported. Polishing wheels 20 are mounted on spindles 23 which are journaled in heads 21 and 24. These heads are attached to members 22 which are supported in sleeves attached to the frame. In the preferred embodiment illustrated in the drawings, there are five of these wheels 20, of any stand ard type. As shown in Fig. 1" two of the wheels 20 are mounted to rotate upon axes obliquely disposed relative to the axis of the members 22. The heads 24 for these wheels are preferably pivotally mounted on vertical axes and may be clamped in any desired an gular position. The driving means for the polishing wheels 20 may comprise a series of pulleys (not shown) directly above the machine connected by suitable individual belts to small pulleys 25 mounted on the spindles 23. I

11 is a Carrier belt which moves in the direction indicated by the arrow in Figs. 1, 1, and 3. It consists of a plurality of metal links pivotally connected together, each link being adapted to receive a work piece to be polished. Each link is provided with plates 12 upstanding at opposite sides of the link, and slotted as shown in Figs. 4 and 18, the size of the slots in the links being chosen to accommodatedifferent portions of the work pieces being operated on. The carrier belt brackets 89 attached to the frame.

of the rods 41-41 adjacent the work holders is supported on horizontal surfaces of the frame and passes around sprocket wheels carried on the shafts 97 and 14. One of these sprocket wheels is shown at 13 in Fig. 3. This sprocket wheel is driven by a ratchet-wheel 15 on the shaft 97. Pivoted on the shaft 97 is a lever 17 to which is pivoted a driving pawl 16. A spring 18 holds the pawl 16 toward the ratchet-wheel 15. The lever 17 also carries a roller 67 which engages with a cam groove in a cam drum 66 on a cam shaft 60. The cam shaft is driven from a main drive shaft 52 by means of gears 57 and 59 and idler gear 58 (see Fig. 2) A pulley 56 on the shaft 52 is driven by a belt from any convenient source of power. By means of this mechanism the carrier belt is advanced step by step, the length of each stop being equal to the length of one link of sleeves 27 are pivotally mounted upon hori-" zontal axes determined by pointed screws 28. The screws 28 are secured in brackets 28 fixed to the tie rod 94. The work holders 26 are adapted to be oscillated about the axes of the screws 28 and their oscillation is controlled by connecting rods 29 attached at I their upper ends to the sleeves 27. These rods have their lower ends attached to the forward ends of arms 30 which are rigidly attached to a shaft 65. The shaft is orcillated by an arm 64 having a roller 100 which contacts with cam plates 63 secured on the cam shaft 60. The roller 100 is held against the cam plates 63, and the work pieces are elevated and held against the wheels 20, by weights 31 on the rearward extensions of the sleeves 27. These weights are movable toward and from the axes of oscillation of the sleeves 27 so that the pressure of the work against a wheel may be controlled within wide limits.

The work is held in the work holders by means which I shall now describe. 4141 are rods extending between the work holders 2626 and supported over the belt 11 by The ends 26-26 terminate in troughs 9696 (see Figs.

1 and 6). Work clamping members 32 are pivoted at 90 to the outer ends of the work holders 26 and are provided with springs 95 \VlllCll. push their free ends downward. These clamping members have horizontally extending lugs 32 which engage in the.

troughs 96 andprevent the clamping members fronrengagingwith the work pieces while the work pieces are in positionin the belt 11. Movement: upward of the" work hold- .ers-26 permits resilient engagement of the free ends of themembers32 *with the work pieces-so that theiworlcmay be retained firmly in positionin the workholders. .As shown m FigsG and'13, the'holders 26 have mould ed surfaces 33 conforming to portions ofthe surface of a work pieceso that "the work pieces are'maintained rigidly in position'by the spring-pressed members 32.

The worlr holder's 26 exten'd on opposite sides of theca-rrier belt lluand are'provided ment in a vertical plane Without obstruction by the carrier belt '11. r

In order to increase the-surface polished by a wheel, means-are providedto automatically move either thew-ork'holders 26 or'the poloscillated about ishing wheels 20 so that the wheels will move both longitudinallyand laterally relatively to wheels to completely pollsh the inside surface the work. In the particular form shown in the drawin s the wheels are moved lon ituda 7 a o upside down in order that inally relatively to the work by reciprocating the wheels,- and the wheels are moved laterally relatively tothe work by oscillating the work holders.

The means for reciprocating the wheels are shown in Fig. 2. F astened to the shaft 52 is a cranx 51 which drives the connecting rod 53 which oscillates thearm 54'an'd the shaft 47 which is attached thereto. Fixed totheshaft 4'? are arms lS which drive connecting rods which are pivoted at -49 to the members v22,-the pivots 49'extend-ing throughopenings 46 in the sleeves 4 5. *By'm'efans of this mechanism the polishing wheels-are-reciprocatedso Y as to traverse over portions-off the work. Rod 58-is adapted to be connectedto the arms 51 and 54. at different points and byf'proper adjustment of the points of connection the oscillation ;of:'j-the -shaft l7 may be varied through wide limits. "Similarly the connecting rods5 0 are adapted to be connected to the arms 48 at. afnulnber' of different points so that individualad'ju'stmentof the" stroke 'of the wheels 20 is provided. i

The means for oscillating thework which are pivotedat 38 to a-bar-39. This bar '39 extends throughout thelength of the machine and'is reciprocate'd by a roller 62 coact-- ing with a camdrum' 61 on the camshaft with the result. that the work holders 26 "are the axes of. the shafts 35.

i The work holders are therefore automatically positions. wheels must be used to completely polish the inside surface of a spoon bowl, two obliquely. mounted wheels engaging the heel of the bowl a wheel gage a different no further v holders- 26 to increase the lateral polishing effect of to the shafts 35, the axes the'screws 28. The lower ends of' the arms. 87 pass through holes instuds- 99 oscillated about two mutually perpendicular -'taxes, viz; the axes of the shafts 35 and the 1::1X6S of the screws 28.v i

"After the; work-pieces have-been operated -upon bythe polishing wheels,'the work hold-' (H5126 are oscillated downward bythe cam ,63. toreturn the work to the-carrier: belt 11. The lugs32 onthe work clamping members =32 drop into the troughs 96, and further-down- Ywardmovement of the -work holders dIOpS the work out'of contact with the members 32 advancing all of the work pieces to their next Usually a plurality of individual and a third wheel engaging the tip portion. After a s'poonhas been operated onby the J-purpOSeI interposea spoon turning devicein =the pathof the carrier belt .11. Asa spoon;,

moves forward onthe belt. 11 the edge of the bowl will come in contact with afixed abutment lO. (See Fig. 18.) As theypoint of contact is below the points of supportof the spoon in'the plates 12 the movement of the belt will cause thespoon to turnover to the'sec- 0nd position shown in Fig.18. The handle of the spoon prevented'from movement upward out'of the slots 12 during-this turning operation by. the rod ll and. a plate 42 en-,-' J gages the tip (611d. OfEthe'bOWl to keep the bowls substantially; in alignment. When turned over the spoon is in posi tion for polishing by: the remaining wheels 20, The surfaces. 33, ofthe workholders which-hold the; spoons while the convex surfaces of the bowls I are being-polished are varie d'to fit the spoons in their, reversed position;

As the-polishing OPQIHJUODSEHPQOII different portions ofa ay be positioned differently to enportion of the spoon bowl,

description of the operation at each station: will be" given. The carrier belt,

the-wheels and the work holders are alltimed;

tomove in accordance-with a predetermined cycle so that the work holders simultaneously pick up spoons from the carrierbelt and move spoon are slmilar except thilhy them intoproper positions relative to the] wheels 20 for individual polishing operations. During ,the, polishing operation the work holders are simultaneously oscillated laterally, the amount of lateral oscillation for each .work holder being controlled by the position ofthe corresponding stud '99; After the cjornpletion of the individual polishing operations which are timed to permit effective and complete polishing of the portions of the spoons engaged by the individual Wheels 20, the transfer members 26 are again simultaneously moved, this time being returned to their lower positions, whereupon the spoons held therein are released and permitted to lie within the slots 12 in the links of the carrier belt 11. The carrier belt 11 is then actuated to advance by one link thereby bringing a different spoon beneath each polishing wheel, whereupon the transfer members 26 are again elevated. After being presented to each of the polishing wheels, the spoons are discharged into the chute 101 which is positioned adjacent to the sprocket wheel 13. The cam drums 61 and 66 and the cam plates 63 are all attached to the shaft 60 and their cam surfaces are positioned so as to automatically secure the sequence of movement of the work holders 26 and of the carrier belt 11 which has just been described.

The machine is also provided with automatic means for periodically supplying abradant material to the polishing wheels. These means are indicated generally at 71 in Fig. 2.

I have thus produced a completely automatic polishing machine which will perform a multiplicity of various polishing operations without attention except to place the work in the carrier belt, which can be done by unskilled labor.

I claim:

1. A polishing machine for spoons comprising in combination, a plurality of polishing wheels, a conveying belt for said spoons, automatic spoon holding and transferring means adapted to remove a spoon from said belt and hold said spoon in contact with a wheel and replace said spoon upon said belt, means to oscillate said holding and transferring means while in position holding a spoon against a wheel to polish the spoon from side to side, and means to move said wheels in a. direction longitudinally of the spoons in said holding and transferring means while contacted by said spoons.

2. A polishing machine for spoons comprising in combination, a plurality of polishing wheels, conveying means to position said spoons for successive operations by said wheels, means on said conveying means loosely engaging the handles of said spoons, a fixed abutment in the path of the bowls of said spoons, and means limiting endwiseand vertical movement of said spoons while engaged by said abutment, whereby advancing movement of said conveying meanswill turn said spoons upside down.

3. A polishing machine comprising a power-driven polishing wheel, automatic means to reciprocate said wheel, a work-carrier belt, automatic means to intermittently advance said belt, a work holder, and auto- 5; A polishing machine comprising, in

combination, a polishing wheel, a work-carrier belt, automatic means adapted to remove a Work piece from said belt and hold said work piece in contact with said polishing Wheel and replace said work piece upon said:

belt, and automatic means to intermittently advance said belt.

6. A polishing machine comprising, in combination, a polishing wheel, a Work-carrier belt, an automatic work holder adapted to remove a work piece from said belt and hold said work piece in contact with said polishing wheel and replace said work piece upon said belt, and means to automatically oscillate said work holder and work piece while said work piece is engaged by said wheel.

7. A polishing machine comprising, in combination, a polishing wheel, a work-carrier belt, automatic means adapted to remove a work piece from said belt and hold said Work piece in contact with said polishing wheel and replace said work piece upon said belt, and automatic means to reciprocate said polishing wheel.

8. A polishing machine comprising, in combination, a polishing wheel, a work-carrier belt, automatic means adapted to remove a Work piece from said belt and hold said work piece in contact with said polishing wheel and replace said work piece upon said belt, and automatic abradant supplying means.

9. A polishing machine comprising a plurality of power-driven polishing wheels, means to reciprocate said polishing wheels, a power-driven carrier belt, means for advancing said belt step by step past said polishing wheels, a plurality of work holders each pivoted on an axis and adapted to raise the work from said carrier belt to operative position in contact witha polishing wheel and to returnthe work to said carrier belt, and means to oscillate each of said work holders about a second axis, the operation of said work holders about each of said axis and of said carrier belt being automatically timed and controlled.

10. A polishing machine comprising a plurality of power-driven polishing wheels,

means to reciprocate said polishing wheels, a V

power-driven carrier belt, means for advancing said belt step by step past said polishing from said carrier belt to operative position in contact with a polishing'wheel and to return the Work to said carrier belt said Work holders being operated by power in one direction and by gravity in the opposite direction, and means to oscillate each of said Work holders about a second axis, the operation of said Work holders about each of said axes and of said carrier belt being automatically timed and controlled.

11. A polishing machine comprising a plurality of power-driven polishing Wheels, means to reciprocate said polishing Wheels, a

oWer-driven carrier belt means for advancing said belt step by step past said polishing Wheels, a plurality of Work holders each pivoted on an axis and adapted to raise the Work from said carrier belt to operative position v in contact With a polishing Wheel and to return the Work to said carrier belt, said Work holders being operated by power in one direction and by gravity in the opposite direction, means to oscillate each of said Work holders about a second axis, and abradant supplying means, the operation of said Work holders about each of said axes and of said carrier belt and of said abradant supplying means being automatically timed and controlled. s DARWIN G. GRISWOLD. 

